Pulley-crowning machine



(No Model.) 2 Sheets-Sheet 1.

S. H. ST. JOHN. PULLEVY GROWNING MACHINE.

o. 557,712. Patented Apr. 7, 1896.

A mm 5: aRAnAMwn om-umo wAsmusmmpzf' (No Model.) 2 Sheets-Sheet 2.

S. H. ST. JOHN. PULLEY, GROWNING MACHINE.

PatentedApr. 7, 1896.

Lll

NITED STATES PATENT OFFICE.

SPENCER ll. ST. JOHN, OF CANYON, COLORADO.

PULLEY-CROWNING MACHINE.

SPECIFICATION forming part of Letters Patent No. 557,712, dated April '7, 1896.

Application filed October 1 1395- To all whom it may concern:

Be it known that I, SPENCER H. ST. J OHN, a citizen of the United States, residing at Canyon, in the county of Fremont and State of Colorado, have invented certain new and useful Improvements in Pulley-Crowning Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to machines for forming the crown upon the face of belt-pulleys. It is intended especially for operation upon wood pulleys, but may be used also upon pulleys made of metal.

The object of the invention is to provide for the rapid and accurate crowning of the pulley by a machine which is automatic in its action; and it consists in providing means for adj ustably mounting the pulley to be operated upon in such manner that a rotating cutter-head acts transversely upon its face, the parts being so disposed and arranged that the plane in which the cutters rotate is perpendicular to a plane passing through the axis of the pulley and through the points at which the cutting-blades come into contact with the pulley-face, so that the center of the are described by the blades across the faceof the pulley is farther from the axis of the latter than are the ends of such are.

The invention consists, further, in various minor details of construction, as hereinafter fully described.

The drawings show, in Figure 1, a side elevation of the machine; Fig. 2, a transverse section of Fig. 1, and Fig. 3 is a detail plan view of a portion of the machine.

The bed or table of the machine comprises the two portions A A, which are preferably secured together as shown. The table A supports a j ournal-block in the form of a double floor-hanger B. This journal-block carries a shaft C, which is driven by a belt 0, running over a pulley 0 upon the shaft C and leading from a driving-shaft. (Not shown.) Upon one end of the shaft C is mounted a cutter- Serial No. 564,341. (No model.)

head D, having its arms radially slotted, as indicated at d, cutters (Z (Z being ad justably secured within these slots.

The table A extends from that end of the table A at which the cutter-head is located. Upon this table A is mounted a sliding plate 6, adjustable in the ways a a to and from the cutter-head, this adjustment being accomplished by means of the screw-threaded rod R, having the hand-crank r and being journaled in suitable blocks secured to the table A and engaging suitable screw-threaded apertures in a raised portion of the platform 6.

A pair of vertical standards E E are mounted upon the plate 6, their alinement being transverse to the direction of movement of this plate. The faces of these standards which are presented to the cutter-head are each provided with a vertical rib G, having its edges undercut. A pair of journal-blocks F F are secured to the standards E E, each having one of its faces channeled to adapt it to the rib G. This construction admits of the free vertical adjustment of the journal-blocks, and they are each supported by a rod M, journaled in a block m, secured to the lower portion of the standard E, a collar m being attached to the rod so as to bear upon the top of the block M, and the rod being screwthreaded and passing through a suitable aperture in the block F.

The rods M M are rotated for the purpose of adjusting the journal-blocks F F by means of a rod P, journaled in one of the standards and carrying a bevel-gear 19, adapted to mesh with a similar gear 0, mounted upon one of the rods M, the rods M M being connected by means of the sprocket-chain Q, running upon sprocket-wheels q (1 upon the rods. Bythis means the journal-blocks are always uniformly adjusted. The rod P is provided with a hand-crank p.

A shaft H is journaled in the blocks F F and is driven by a worm-gear comprising the wornrwheel h, mounted upon the shaft, and a vertical worm J, carried by and projecting below the platform e and having at its lower end a worm-wheel j in engagement with a worm K, formed on a horizontal rod 75, journaled in hangers secured to the tables A A and driven by the belt L, running upon conepulleys I, mounted upon the shaft 7t, and Z, mounted upon the shaft 0.

The pulley, as X, is placed upon the shaft H and the machine is so adjusted by means of the rods P R as to bring the face of the pulley to the plane in which the cuttingblades d d revolve, the vertical adjustment being such that the blade attacks the edge of the pulley exactly upon a line with its axis. As the blade passes through the arc of a circle in crossing the face of the pulley, it is obvious that all intermediate portions of such are, the are being formed in a vertical plane, are farther removed from the axis of the pulley than are its ends, the maximum difference being at the center of the arc, and hence the cut across the face of the pulley is convex as to the axis of the latter. The degree of convexity of the crown thus formed upon the face of the pulley is determined by the distance at which the cutters (Z (Z are fixed from the arbor of the cutter-head, the arc of a small circle having a more pronounced curvature than an arc of the same length of a larger circle.

The cutter-head may be rotated at high speed. The rotation of the pulley is, of course, for the purpose of feeding it to the cutters, and its speed may be adjusted in accordance with the action of the cutters by means of the cone-pulleys Z Z.

I believe myself to be the first to form a curved surface upon a circular or band face by disposing and moving the blades in the manner, with reference to the surface to be operated upon, described.

\Vithout therefore limiting myself to the details of construction as above set forth, I claim as my invention 1. The combination with a rotative cutterhead having a cutting-blade projecting from its diskface, and so disposed that it will cut in a plane parallel with the plane of rotation of the disk, of means for holding a pulley in a plane perpendicular to the plane of the cutter-head, and so related thereto that the cuttin g-blade engages and crosses the peripheral face of the pulley, substantially as described and for the purpose specified.

2. The combination with a rotative cutterhead having a cutting-blade projecting from its diskface, of means for holding a pulley in a plane perpendicular to the plane of the cutter-head, and so related thereto that the cutting-blade engages and crosses the peripheral face of the pulley, the parts being so disposed that radii of the pulley and cutter-head drawn to the points of initial and final contact of the cutting-blade with the pulley are relatively perpendicular.

3. In a pulley-crowning machine the combination with a rotative cutter-head having a cutting-blade upon its disk-face, of means for holding the pulley in such position that the blades cut across the face of the pulley, the ends of the out being in radial planes of the pulley which are perpendicular to the plane in which the blades rotate, substantially as described and for the purpose specifled.

4. In a pulley-crowning machine the combination with a rotative cutter-head, having a cutting-blade upon its disk-face and so disposed that it will cut in a plane parallel with the plane of rotation of the disk, of means for holding a pulley in a plane perpendicular to the plane in which the cutter-head rotates, substantially as described and for the purpose specified.

5. In a pulley-crowning machine the combination with a rotative cutter-head, having a cutting-blade upon its disk-face and so disposed that it will cut in a plane parallel with the plane of rotation of the disk, of means for holding a pulley in a plane perpendicular to the plane in which the cutter-head rotates, and'means for adjusting the pulley radially and axially as to the cutter-head, substantially as described and for the purpose specified.

6. In a pulley-erownin g machine the combination with a rotative cutter-head, having a cutting-blade upon its diskface and so disposed that it will cut in a plane parallel with the plane of rotation of the disk, of means for holding a pulley in aplane perpendicular to the plane in which the cutter-head rotates, and means for causing the pulley to rotate, substantially as described and for the purpose specified.

7 In a pulley-crowning machine the combination with a rotative cutter-head, having a cutting-blade upon its disk-face and so disposed that it will cut in a plane parallel with the plane of rotation of the disk, of means for supporting and rotating a pulley in aplane perpendicular to the plane in which the cut ter-head rotates, and means for adjusting the pulley axially as to the cutter-head, substantially as described and for the purpose specified.

8. In a pulley-crowning machine the combination with a rotative cutter-head, having cutting-blades, located upon its disk-face and so disposed that it will cut in a plane parallel with the plane of rotation ofothe disk, of means for supporting and rotating a pulley in a plane perpendicular to the plane in which the cutter-head rotates, and means for relatively adjusting the pulley-support and the cuttingblades so that the latter will cut across the face of the pulley carried by the support, substantially as described and for the purpose specified.

9. In a pulley-crowning machine the combination with a rotative cutter-head having cutting-blades located upon its disk-face, of means for supporting and rotating a pulley in a plane perpendicular to the plane in which the cutter-head rotates, and means for relatively adjusting the cutting-blades and the pulley -support so that the pulley may be brought into such position that the blades will cut across its face, the initial and final contacts of the out being upon radii of the pulley perpendicular to the plane in which the blades rotate, substantially as described and for the purpose specified.

10. In a pulley-crowning machine the combination with means for supporting and rotating a pulley to be operated upon, of a cutter-head arranged to rotate in a plane perpendicular to the plane in which the pulley is rotated, and cutting-blades carried by the disk-face of the head, the various parts being so adjusted that the blades cut across the face of the pulley, the initial and final contact of the blade being upon radii of the pulley perpendicular to the plane in which the head rotates, substantially as described and for the purpose specified.

11. The combination in a pulley-crowning machine, of a rotat-ive cutter-head, and a cutting-blade carried by the disk-face of and radially adjustable upon the head, and so disposed that it will cut in a plane parallel with the plane of rotation of the head, of means for carrying a pulley to be operated upon in such manner that the blade will cut across the face of the pulley, substantially as described and for the purpose specified.

12. In a pulley-crowning machine the combination with a rotative cutter-head, and a cutting-blade carried by the disk-face of and radially adjustable upon the head, of means for supporting a pulley to be operated upon in such manner that the blade will cut across its face, and means for adjusting the pulleysupport relatively as to the cutting-blade whereby the initial and final contacts of the blade are upon radii of the pulley perpendicular to the plane in which the blade rotates, substantially as described and for the purpose specified.

13. In a pulley-crowning machine the combination with a rotative cutter-head having its cutting-blades projecting from its diskface and so disposed that it will cut in a plane parallel with the plane of rotation of the disk, and with means for supporting a pulley to be operated upon so that the blades cut across its face, of mechanism for rotating the head,

and the pulley and means for relatively adjusting the speed of such parts, substantially as described and for the purpose specified.

14. The combination in a pulley-crowning machine of the shaft, 0, the overhung cutterhead, D, mounted thereon, and cutting-blades carried upon the disk-face of the head, and so disposed that it will cut in a plane parallel with the plane of rotation of the head, of the standards E, E, arranged in front of the diskface of cutter-head and alined parallel therewith, means for varying the distance of such standards from the head, vertically-adjustable j ournal-blocks, F, F, carried by the standards, a shaft, H, journaled in the blocks F, F, and adapted to carry the pulley to be operated upon and mechanism for rotating the shafts C, H and for relatively adjusting the speed of such shafts, substantially as described and for the purpose specified.

15. In a pulley-crowning machine the combination with a rotative cutter-head a shaft for carrying the head, and a vertically-adj ustable pulley-supporting shaft set parallel with the plane of rotation of the cutter-head, of a worm-wheel mounted upon the pulleysupporting shaft, a vertical worm-shaft for cooperating with the worm-wheel and means for rotating the worm-shaft, substantially as described and for the purpose specified.

16. In a pulley-crowning machine the combination with a rotative cutter-head, and with a pulley-supporting shaft parallel with the plane of rotation of the cutter-head and radially and axially adjustable with reference thereto, of a worm-wheel mounted upon the pulley-shaft, a worm-shaft cooperating with such wheel, a worm-wheel mounted upon the worm-shaft, a second worm-shaft for cooperating with such wheel and means for rotating said second shaft, substantially as described and for the purpose specified.

In testimony whereof I have hereunto set my signature in the presence of two witnesses.

SPENCER H. ST. JOHN.

lVitnesses:

JAMES J. CONE, CHAS. E. MCRAY. 

